Tie-down hook



FIG. 1 is a side elevational view showing my new design for a tie-down hook, the opposite side being a mirror image thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is an isometric view thereof. 

The ornamental design for a tie-down hook, substantially as shown. 